From elsewhere in The Post: Children who have an older, autistic sibling have about a 19 percent chance of also developing the disorder, new research finds. If multiple older siblings have autism, the chance increases to 32 percent. Researchers previously thought kids had a 3 to 10 percent chance of having autism if an older sibling had it.
The findings, published in the journal Pediatrics, are based on a study of 664 infants with at least one older brother or sister who had been diagnosed with autism.
“As expected, the risk varied by sex. More than 26 percent of the boys were diagnosed with autism, compared with 9 percent of the girls,” writes Rob Stein in The Checkup.